<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="/05/three" method="post">
        用户名&nbsp;<input type="text" name="username"><br/>
        <input type="submit" value="post方式提交">
    </form>
</body>
</html>